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Not "that anonymous user." In my experience, avoiding Join statements is a common best practice for Clickhouse users seeking performant queries on large dataset
by biggestdummy 3y ago
Not "that anonymous user." In my experience, avoiding Join statements is a common best practice for Clickhouse users seeking performant queries on large datasets. A couple examples...
https://medium.com/datadenys/optimizing-star-schema-queries-with-in-queries-and-denormalization-cc281bbe19a5 https://medium.com/datadenys/optimizing-star-schema-queries-...
https://posthog.com/blog/secrets-of-posthog-query-performance#whats-next https://posthog.com/blog/secrets-of-posthog-query-performanc...
- riku_iki 3y ago> avoiding Join statements is a common best practice for Clickhouse users seeking performant queries on large datasets its common best practice on any database, because if both joined tables don't fit memory, then merge join is O(nlogn) operation which indeed many times slower than querying denormalized schema, which will have linear execution time.